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We study the asymptotic behaviour of two-loop electroweak corrections atenergies Q >> M_W, where logarithms of the type ln(Q/M_W) become dominant. Thecalculation of the leading and next-to-leading logarithmic terms for masslessand massive fermion-scattering processes is summarized. The derivations areperformed diagrammatically within the spontaneously broken electroweak theory.We find that the soft and collinear singularities resulting from photons can befactorized into a QED-like term and that, up to logarithms of the Z-W massratio, the effects of symmetry breaking cancel. This result supportsresummation prescriptions that are based on a symmetric SU(2)xU(1) theorymatched with QED at the electroweak scale.

Two-loop electroweak Sudakov logarithms for massive fermion scattering